Robustness of the van Hove scenario for high-Tc superconductors
V. Yu. Irkhin, A. A. Katanin, M. I. Katsnelson
Abstract
The pinning of the Fermi level to the van Hove singularity and the formation of flat bands in the two-dimensional t-t' Hubbard model is investigated by the renormalization group technique. The "van-Hove" scenario of non-Fermi-liquid behavior for high-Tc compounds can take place in a broad enough range of the hole concentrations. The results are in qualitative agreement with the recent ARPES data on La2CuO4.
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